Method of manufacturing commercial rubber tubes or fabric hose



May 31, 193s. A, MEYER 2,119,465

METHOD OF MANUFACTURNG COMMERCIAL RUBBER TUBES OR FABRIC HOSE Fi 1ed Apri1 27, 1935 /g gyra/7 Patented May 1,1938 y I Y UNITED .STATES rli'luirrA OFFICE] METHOD F MANUFACTURING COMMER- CIAL RUBBER TUBES 0R FABRIC HOSE Arnold Meyer, Harburg-Wilhelmsburg, Germany,

assignor tothe irm Harburger Gummiwaren- Fabrik Phoenix Aktiengesellschaft, Harburg- Wilhelmsburg, Germany V 5 Application April 21, 1935, serial No. 13,659 In Germany Decemberl, 1933 4 claims.` (c1. 154-8) .L

The present invention consists in a method of of the method in which a mandrel is employed manufacturing commercial rubber tubes with for manufacturing the tube 1S kDOWII- `It iS 11012 fabric coverings in which Athe fabric coverings known, however, to use the three-roller device and the other Wall-reinforcing means are wound to provide a tube with coverings and other wall-fv 6 on without thel use of a mandrel inserted in the reinforcing means without the simultaneous eml5 inner rubber tube, and in which the vulcaniz'aployment of a mandrel; tion of the tube withthe fabric covering and The tube manufactured in themanner de provided with other wall-reinforcing means can scribed, Owing 110 the fat that nlllSiOn 0f all' be eiected without an inserted mandrel. l between the. layers is suiiiciently avoided, can be l0 The inner rubber tube is filled with an inert vulcanized without being covered with a winding 1.0 liquid, e. g. water or an aqueous solution of inert L material and without a casing of metal, e. g. a

salts or with an inert gas, care being' taken to lead casing or press mould. f avoid subjecting the inner tube t'o such vpressure In order to impart to the finished tube a rgood as would cause it `to expand, the tube being appearance, a coating of rubber compound can ,16 thereupon closedat'its ends and provided with a be resorted to in conjunction with the covering .15 covering of fabric or of cord threads, (with or winding, said coating being effected by means of without weft threads), together with other wallthe hose or tube machine. In addition an outer reinforcing means, the indiierent gas being rubber coating may also be applied.' air, nitrogen, carbonio acid, etc. The covering By means of the newl method `'various advanand other wall-reinforcing means, while being tages are attained, for instance a simplied and wrapped, lie along their entire length upon surconsiderably cheaper manufacture of commercial' faces, for instance rollers of a known three-roller rubber'tubes and`hose-pipes, simplified apparadeviceemployed for such covering windings and tus, improved quality of the flnished product, par-. are laid with the use of externally appliedpresticularly in regard to strength of the tube to' sure at right angles to the direction of the axis higher pressures, and the possibility of heating 25 of a tube around, the inner tube. it in-the open, i. e. vulcanization outside of a The tube thus obtained is vulcanized. mould or a winding replacing the mould.

'I'he inner rubber tube filled with the liquid or In the accompanying drawing; l with the gas is stressed uniformly at right angles Fig. 1 shows a cross-section of "a part of the to the axis of the tube over its entire length tube a, the end -b of'which iscompressed and that is to say, in the case of this mode of windthen folded down. i 1 f` ing over the coverings and the wall-reinforcing Fig. 2A shows a cross-section of the tube a means. Since, moreover, the tube, during the between the roller c, c', c", which is covered by winding of the coverings and the other wallthe fabrice placed on the table d and the cover 3r reinforcing means, lie's protected over its entire adhering to the said fabric. l 35 length between surfaces, :then the required Fig. 3 shows a longitudinal section of a part of amount of pressure can be employed without the tube-a already provided with the fabric e; danger of deforming the inner tube, such as is the said tube being supplied with a coating `of necessary to prevent the inclusion of air between 7rubber compound h in the cross-head g of a, 40 the layers of the coverings or other wall-reintubing machine. I 40 forcing means. By this means the elastic nature What I claim is: of the filling of the inner tube is of particular 1. A method of manufacturing rubber tubes advantage because it is rendered' possible thereby having fabric coverings comprising filling a rubto even out the inequalities, particularly ,at the ber tube with an inert uid at approximately overlapping points, between the individual superatmospheric pressure, applying pressure to' said 45 posed layers of the wrappings and other walltube along at least one line parallel to the lonreinforcing means. gitudinalaxis of said-tube to partially;collapse` This particular advantage ,is not attained when said tube, applying a fabriccoverlng to the surmandrels are employed or even in the case of the face of the tube at right angles to the axis there- 59 known method in which a mandrel is not emof while in its partially collapsed condition, ap- 50 ployed) but in zwhich the tube is not simultaneplyingan outer rubber coating and finally vulyously and uniformly wrapped over its entire canizing the tube in the open. length with coverings and other wall-reinforcing 2. A method of manufacturing rubber tubes means. having fabric coverings comprising closing both The use of the three-roller device in the case ends of a tube, applying pressure to said tube 55 2 .21,119,485 v .along at least one line parallel to the longitudinal 3. A method as claimed in claim 2 wherein the axis or said tube to partially collapse said tube, application ,0f pressure t0 the tube 'and the apapplying a' Iabric. covering to the surface of the piication of the fabric coveringv .take place subtube at right angles to the axis thereof while in stantially slmultaneously. v 5 its partially collapsed lcondition, applying an, 4. A metho'd as claimed in claim 2 wherein the 5 outer rubber coatingJ and finally vulcanizing the fabric is summed. l 

